ios: add CrNet

ios/crnet/crnet_net_log.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_CRNET_CRNET_NET_LOG_H_
+#define IOS_CRNET_CRNET_NET_LOG_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "net/log/net_log.h"
+
+namespace base {
+class FilePath;
+class DictionaryValue;
+}
+
+namespace net {
+class WriteToFileNetLogObserver;
+}
+
+// CrNet-specific NetLog subclass.
+// This class can be used as a NetLog where needed; it logs all log entries to
+// the file specified in Start().
+class CrNetNetLog : public net::NetLog {
+ public:
+  enum Mode {
+    LOG_ALL_BYTES,
+    LOG_STRIP_PRIVATE_DATA,
+  };
+
+  CrNetNetLog();
+  ~CrNetNetLog() override;
+
+  // Starts logging to the file named |log_file|. If |mode| is LOG_ALL_BYTES,
+  // logs all network traffic, including raw bytes. If |mode| is
+  // LOG_STRIP_PRIVATE_DATA, strips cookies and other private data, and does
+  // not log raw bytes.
+  bool Start(const base::FilePath& log_file, Mode mode);
+
+  // Stops logging.
+  void Stop();
+
+ private:
+  // Underlying file writer. This observer observes NetLog events and writes
+  // them back to the file this class is logging to.
+  scoped_ptr<net::WriteToFileNetLogObserver> write_to_file_observer_;
+
+  base::ThreadChecker thread_checker_;
+};
+
+#endif  // IOS_CRNET_CRNET_NET_LOG_H